Rainbow Electronics LM60 - Manual

LM60
2.7V, SOT-23 or TO-92 Temperature Sensor
General Description
The LM60 is a precision integrated-circuit temperature sen-
sor that can sense a −40˚C to +125˚C temperature range
while operating from a single +2.7V supply. The LM60’s
output voltage is linearly proportional to Celsius (Centigrade)
temperature (+6.25 mV/˚C) and has a DC offset of +424 mV.
The offset allows reading negative temperatures without the
need for a negative supply. The nominal output voltage of the
LM60 ranges from +174 mV to +1205 mV for a −40˚C to
+125˚C temperature range. The LM60 is calibrated to pro-
vide accuracies of
± 2.0˚C at room temperature and ± 3˚C
over the full −25˚C to +125˚C temperature range.
The LM60’s linear output, +424 mV offset, and factory cali-
bration simplify external circuitry required in a single supply
environment where reading negative temperatures is re-
quired. Because the LM60’s quiescent current is less than
110 µA, self-heating is limited to a very low 0.1˚C in still air in
the SOT-23 package. Shutdown capability for the LM60 is
intrinsic because its inherent low power consumption allows
it to be powered directly from the output of many logic gates.
Features
n Calibrated linear scale factor of +6.25 mV/˚C
n Rated for full −40˚ to +125˚C range
n Suitable for remote applications
n Available in SOT-23 and TO-92 packages
Applications
n Cellular Phones
n Computers
n Power Supply Modules
n Battery Management
n FAX Machines
n Printers
n HVAC
n Disk Drives
n Appliances
Key Specifications
n Accuracy at 25˚C: ± 2.0 and ± 3.0˚C (max)
n Accuracy for −40˚C to +125˚C: ± 4.0˚C (max)
n Accuracy for −25˚C to +125˚C: ± 3.0˚C (max)
n Temperature Slope: +6.25mV/˚C
n Power Supply Voltage Range: +2.7V to +10V
n Current Drain @ 25˚C: 110µA (max)
n Nonlinearity: ± 0.8˚C (max)
n Output Impedance: 800
Ω
(max)
Typical Application
Connection Diagrams
SOT-23
01268101
Top View
See NS Package Number MA03B
TO-92
01268123
See NS Package Number Z03A
01268102
V O = (+6.25 mV/˚C x T ˚C) + 424 mV
Temperature (T) Typical V
O
+125˚C +1205 mV
+100˚C +1049 mV
+25˚C +580 mV
0˚C +424 mV
−25˚C +268 mV
−40˚C +174 mV
FIGURE 1. Full-Range Centigrade Temperature Sensor
(−40˚C to +125˚C) Operating from a Single Li-Ion
Battery Cell
July 2001
LM60
2.7V
,
SOT
-23
or
T
O-92
T
emperature
Sensor
© 2001 National Semiconductor Corporation DS012681 www.national.com